Michael Stephen Callahan, 71, of Marshfield, passed away on Thursday, January 14, 2021. He was the longtime companion of Evelyn Cronshaw. Born on March 23, 1949 in Dorchester, he was the son of the late William F. Callahan and Anne "Mildred" (Robertson) Callahan. Michael graduated from Suffolk University in 1970 and then New England Law in 1978. He enjoyed politics, skiing, traveling, museums, the Boy Scouts, karaoke, the Boston Celtics. He was a devoted son. In addition to Evelyn, he is survived by his children Ryan, Meghan, and Brendan; grandchildren Paige and Penelope; and his siblings Catherine, William, Patricia and Jean. Services to be announced.